We are in the process of updating one of our mowing setups. Currently running a GMC 3500 with the 6.6 Duramax and pulling a 28' goose with 4 ztrs. Looking into a Ford F350 or upgrading a size to the F450. We run 450s on the landscaping side with dumps but this would be just a crew cab with flatbed. Didn't know if anyone ran a similar setup (F350/F450 with large goose) to compare mpg. We are looking at either the 6.0 or the 6.4 but haven't decided which engine would be more efficient. The 450 may be overkill to some degree. But if it will be just as efficient as the 350 then it's something to look at... Thanks.